Oh geesh, you guys are no fun. This is a hypothetical question and we're talking about a PERFECT in every way, including genetically, dog.
Problem is you don't actually know that she is genetically perfect. She does not have any health concerns or diseases but she could be a carrier and you wouldn't know it because you don't have the background.If that genetically perfect female really existed, I wouldn't think less of a breeder for using her as they tried to develop a new breed or improve on the one we have.
I don't know if it works this way with dog genetics, but some human diseases skip generations. If you don't know the parents or grand parents history, then there is no way to know that this is a genetically perfect dog.